Scanning Electron Microscope

21 cases · 58 images for “corrosion”

Crevice Corrosion in a Subsea System — Aspect Before Analysis

Scanning Electron Microscope — sub-branches

Fractography by SEM 10Kalling Etched Micrography by SEM 2Micrography by SEM 7Nital Etched Micrography by SEM 8Surface Aspect by SEM 31

Results

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The through wall cracking was opened and the fracture surface presents a full integranular morphology, typical of an intergranular stress corrosion cracking.
79
VIEW
ML00165 / Jul.2020
SCC of Aluminum Bronze Heating Coil
M - Aluminum BronzeP - Seamless tubeAp - Oil and GasCd - Stress Corrosion
Cm - Fractography by SEMDf - Stress Corrosion Cracks
Low magnification SEM image showing the brittle aspect of the cracks in the bolt thread.
61
VIEW
ML00157 / Feb.2020
Bolts Under Chloride SCC Conditions
M - Austenitic Stainless SteelP - BoltAp - Oil and GasCd - Stress Corrosion
Cm - Surface Aspect by SEMDf - Brittle Cracks
Microscopical aspect by scanning electron microscopy (SEM) of the external surface of a drilling tool in a position that presented localized deposits and corrosion under deposit. The deep corrosion in a short time is only possible associated to the biological growth and aggressive environment generated by the microorganisms metabolites - Microbiologically Induced Corrosion (MIC).
104
VIEW
ML00135 / May.2018
MIC of a Non Magnetic Drilling Tool
M - High Mn Austenitic SteelP - Tubular ForgingAp - O&G Well DrillingCd - Pitting Corrosion
Cm - Surface Aspect by SEMDf - Localized Deposits
Micrography of a transverse section of the shell plate in a cracked position showing the transgranular morphology of the stress corrosion cracks.
167
VIEW
ML00019 / Apr.2017
Transgranular SCC in Boiler Steam Drum
M - CMn SteelP - Rolled PlateAp - BoilerCd - Stress Corrosion
Cm - Nital Etched Micrography by SEMDf - Transgranular Cracking
Regions of the pin thread presenting pitting corrosion.
635
VIEW
ML00016 / Apr.2017
SCC in Free Cutting 303SS
M - Austenitic Stainless SteelP - Machined PartAp - OffshoreCd - Stress Corrosion
Cm - Surface Aspect by SEMDf - Localized Corrosion
After opening the crack the fracture surface presented different aspects close to the internal surface and through the wall propagation. Intergranular at the surface, showing intergranular SCC mechanism, and transgranular with striation, showing the contribution of pulsing loads.
101
VIEW
ML00011 / Oct.2017
Intergranular SCC of Pure Nickel
M - Unalloyed NickelP - Wrought FittingAp - Chemical IndustryCd - Stress Corrosion
Cm - Fractography by SEMDf - Through Wall Cracking
Aspect of the spring surface, with a layer of corroded products, and pits.
36
VIEW
ML00172 / Mar.2021
Brittle Fracture of a LAS Valve Spring
M - Low Alloy Medium Carbon QTP - SpringAp - Oil and GasCd - Brittle Fracture
Cm - Surface Aspect by SEMDf - Corrosion
Scanning electron microscopy aspect of the region inside of a pit. The aspect is of a chemical attack, generated by the metabolic by-products of the adhered microorganism. The effect is of a localized dissolution and the granular tube microsctruture is revealed.
40
VIEW
ML00170 / Sep.2020
MIC in Aluminum Brass Tubes
M - Aluminum BrassP - Seamless tubeAp - MaritimeCd - Preferential Dissolution
Cm - Surface Aspect by SEMDf - Corrosion

More from these cases

ML00165 — SCC of Aluminum Bronze Heating CoilM - Aluminum BronzeP - Seamless tubeAp - Oil and GasCd - Stress Corrosion
Fractographic detail of the through wall cracking after opening, presenting a full integranular morphology, typical of an intergranular stress corrosion cracking.
79
VIEW
ML00165 / Jul.2020
SCC of Aluminum Bronze Heating Coil
M - Aluminum BronzeP - Seamless tubeAp - Oil and GasCd - Stress Corrosion
Cm - Fractography by SEMDf - Stress Corrosion Cracks
ML00157 — Bolts Under Chloride SCC ConditionsM - Austenitic Stainless SteelP - BoltAp - Oil and GasCd - Stress Corrosion
Detail of the bolt thread in a SEM image, showing parts of the thread removed in a brittle way.
62
VIEW
ML00157 / Feb.2020
Bolts Under Chloride SCC Conditions
M - Austenitic Stainless SteelP - BoltAp - Oil and GasCd - Stress Corrosion
Cm - Surface Aspect by SEMDf - Brittle Fracture
ML00135 — MIC of a Non Magnetic Drilling ToolM - High Mn Austenitic SteelP - Tubular ForgingAp - O&G Well DrillingCd - Pitting Corrosion
Microscopical aspect by scanning electron microscopy (SEM) of the external surface of a drilling tool in a position that presented localized deposits and corrosion under deposit. It is possible to see that the strain hardened surface was etched by the aggressive metabolites of the microorganisms.
90
VIEW
ML00135 / May.2018
MIC of a Non Magnetic Drilling Tool
M - High Mn Austenitic SteelP - Tubular ForgingAp - O&G Well DrillingCd - Pitting Corrosion
Cm - Surface Aspect by SEMDf - Localized Corrosion
ML00019 — Transgranular SCC in Boiler Steam DrumM - CMn SteelP - Rolled PlateAp - BoilerCd - Stress Corrosion
Micrographic detail of the transgranular stress corrosion cracking.
69
VIEW
ML00019 / Apr.2017
Transgranular SCC in Boiler Steam Drum
M - CMn SteelP - Rolled PlateAp - BoilerCd - Stress Corrosion
Cm - Nital Etched Micrography by SEMDf - Transgranular Crack
ML00016 — SCC in Free Cutting 303SSM - Austenitic Stainless SteelP - Machined PartAp - OffshoreCd - Stress Corrosion
Regions of the localized corrosion spots associated to non metallic inclusions.
123
VIEW
ML00016 / Apr.2017
SCC in Free Cutting 303SS
M - Austenitic Stainless SteelP - Machined PartAp - OffshoreCd - Stress Corrosion
Cm - Surface Aspect by SEMDf - Non Metallic Inclusions
Detail of the pin surface showing that the material easily cracks because it presents regions of localized corrosion.
45
VIEW
ML00016 / Apr.2017
SCC in Free Cutting 303SS
M - Austenitic Stainless SteelP - Machined PartAp - OffshoreCd - Stress Corrosion
Cm - Surface Aspect by SEMDf - Fracture
ML00011 — Intergranular SCC of Pure NickelM - Unalloyed NickelP - Wrought FittingAp - Chemical IndustryCd - Stress Corrosion
After opening the crack the fracture surface presented different aspects close to the surface, initiation mechanism, and through the wall propagation. Detail of the intergranular cracking mechanism close to the internal surface.
98
VIEW
ML00011 / Oct.2017
Intergranular SCC of Pure Nickel
M - Unalloyed NickelP - Wrought FittingAp - Chemical IndustryCd - Stress Corrosion
Cm - Fractography by SEMDf - Intergranular Cracking
After opening the crack the fracture surface presented different aspects close to the internal surface, in the initiation, and through the wall propagation. Detail of the transgranular striation, showing the contribution of pulsing loads.
98
VIEW
ML00011 / Oct.2017
Intergranular SCC of Pure Nickel
M - Unalloyed NickelP - Wrought FittingAp - Chemical IndustryCd - Stress Corrosion
Cm - Fractography by SEMDf - Fatigue Striation
After opening the crack the fracture surface presented different aspects close to the internal surface, in the initiation, and through the wall propagation. Detail of the transgranular striation, showing the contribution of pulsing loads.
82
VIEW
ML00011 / Oct.2017
Intergranular SCC of Pure Nickel
M - Unalloyed NickelP - Wrought FittingAp - Chemical IndustryCd - Stress Corrosion
Cm - Fractography by SEMDf - Fatigue Striation